In "Arcane," Jinx, originally named Powder, is a young girl from Zaun who, along with her sister Vi, becomes orphaned after a failed uprising against Piltover. Traumatized by the loss of her family and the events surrounding it, Powder transforms into the chaotic and dangerous Jinx. Here's a more detailed look at Jinx's backstory: Early Life: Powder was born in Zaun, the impoverished undercity, and was the younger sister of Vi. Orphanhood: She and Vi lost their parents during a riot turned battle on the bridge between Piltover and Zaun. Vander's Adoption: After the battle, Vander, the leader of the Zaun rebellion, found the two siblings and adopted them, along with his own foster children, Mylo and Claggor. The Arcane Crystal Incident: During a raid on Jayce's penthouse in Piltover, Powder accidentally causes a massive explosion after mishandling a set of arcane crystals, leading to the deaths of Vander, Mylo, and Claggor. Transforming into Jinx: The trauma of losing her family and the events surrounding the explosion, along with Silco's manipulation, leads to Powder's transformation into the chaotic and dangerous Jinx. Jinx's Personality: Jinx is characterized by her chaotic and destructive nature, her twisted sense of humor, and her enjoyment of being a criminal. Relationships: Jinx's relationships include Vi (her sister), Mylo and Claggor (her adopted brothers), and Silco (her adopted father and mentor).